Picking a font size for the web used to be really easy. 16 points and you’re done. You could feel confident that your content would be decently readable on PC or Mac, Netscape or IE. Man, have times changed.
Typography
What's the Best Font Size For the web? Well, It Depends… — Imarc
Proof of concept in software development is a controversial topic. The person that came up with a software idea is usually convinced of its relevance. And stakeholders usually don't want to spend time on something that is not even going to be included in the final product.
Everyday digital interfaces include a rich variety of images, visualizations, and other pictures. However, more than anything else, they are made of words. Oh so many words. As we equip teams to design and code usable, consistent, beautiful interfaces using systems, it’s essential that words depend on a strong foundation of typography.